Centrifugal compressor, water chilling unit and electrical equipment

Abstract

The embodiment of the utility model discloses a centrifugal compressor, a water chilling unit and electrical equipment, which are characterized in that a motor mounting cavity is formed in a main shell, and a motor part is mounted in the motor mounting cavity; the volute structure and the diffuser are connected to the end of the main shell, a diffusion cavity is defined between the volute structure and the diffuser, the motor rotor penetrates through the stator assembly and the diffuser so as to extend into the diffusion cavity, and the end, located in the diffusion cavity, of the motor rotor is connected with an impeller; wherein the motor rotor is sleeved with a comb tooth sealing piece and a bearing assembly which are distributed in the axial direction, the comb tooth sealing piece is sleeved with the diffuser, the ends, deviating from each other, of the comb tooth sealing piece and the bearing assembly and / or the inner circumferential wall of the comb tooth sealing piece are / is provided with sealing tooth parts, and the diffuser or the diffuser and the comb tooth sealing piece jointly define a cooling flow channel. According to the centrifugal compressor, the gas leakage loss can be reduced, the energy efficiency of the centrifugal compressor is improved, and the operation reliability of motor parts can be guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal compressors, in particular to a centrifugal compressor, a chiller and electrical equipment. Background Art

[0002] Centrifuges are widely used in the industrial field, mainly in centrifugal refrigeration compressors, air compressors, blowers and other high-speed rotating machinery, and all of them compress the gas centrifugally through the high-speed rotation of the impeller, and diffuse the pressure through the plane between the diffuser and the volute to convert the dynamic pressure into static pressure. In this process, due to the gap between the rotor and the stator, the gas at the impeller will leak from between the rotor and the stator into the motor cavity, causing gas leakage losses, which in turn leads to low efficiency of the compressor. Moreover, the leaked gas is high-temperature gas, which will also cause the internal parts of the motor cavity to become high in temperature, affecting the operating reliability of the internal parts of the motor cavity. There is room for improvement. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a centrifugal compressor, which can reduce gas leakage loss, improve the compression efficiency of the centrifugal compressor, thereby improving the energy efficiency of the centrifugal compressor, and ensure the operating reliability of motor components.

[0004] According to the centrifugal compressor of the embodiment of the utility model, it includes: a main casing, a motor installation cavity is formed in the main casing, a motor component is installed in the motor installation cavity, the motor component includes a stator assembly and a rotor assembly, and the rotor assembly includes a motor rotor; a volute structure and a diffuser, the volute structure and the diffuser are connected to the end of the main casing, a diffusion cavity is defined between the volute structure and the diffuser, the motor rotor is penetrated by the stator assembly and the diffuser to extend into the diffusion cavity, and an impeller is connected to one end of the motor rotor located in the diffusion cavity; wherein, the motor rotor is provided with an axially distributed comb seal and a bearing assembly on the outer sleeve, the diffuser is sleeved outside the comb seal, the ends of the comb seal and the bearing assembly facing away from each other and / or the inner circumferential wall of the comb seal are provided with sealing teeth, and the diffuser or the diffuser and the comb seal jointly define a cooling channel.

[0005] According to the centrifugal compressor of the embodiment of the utility model, sealing teeth are provided at the ends of the comb tooth seal and the bearing assembly facing away from each other and on the inner circumferential wall of the comb tooth seal to increase the path length of the gas leakage process, thereby reducing gas leakage losses, improving the compression efficiency of the centrifugal compressor, and further improving the energy efficiency of the centrifugal compressor. The gas temperature can be lowered through the cooling flow channel, thereby ensuring the operating reliability of the motor components in the motor installation cavity, with better use effect and wider scope of application.

[0006] According to the centrifugal compressor of some embodiments of the present invention, the diffuser is formed with an inlet cavity and an outlet cavity, a cooling cavity is formed between the diffuser and the comb tooth seal, and the inlet cavity and the outlet cavity are respectively connected to the cooling cavity to jointly construct the cooling flow channel.

[0007] According to the centrifugal compressor of some embodiments of the present invention, the inlet cavity and the outlet cavity are separated by a partition, and the inlet cavity and the outlet cavity are symmetrically distributed on both sides of the cooling cavity.

[0008] According to the centrifugal compressor of some embodiments of the present invention, the cooling chamber is constructed as an annular chamber distributed around the comb tooth seal, and the diffuser is provided with a first flow hole connecting the inlet chamber and the cooling chamber and a second flow hole connecting the outlet chamber and the cooling chamber.

[0009] According to the centrifugal compressor of some embodiments of the present invention, the first flow hole and the second flow hole are located on both sides of the cooling cavity and are distributed opposite to each other along the radial direction of the cooling cavity.

[0010] According to the centrifugal compressor of some embodiments of the present invention, the inlet cavity and the outlet cavity are both constructed as arc-shaped cavities extending along the circumference of the diffuser, and the inlet cavity and the outlet cavity are cocentrically distributed.

[0011] According to the centrifugal compressor of some embodiments of the utility model, the diffuser is provided with a plurality of inlets, the plurality of inlets are distributed and spaced apart in the circumferential direction of the diffuser and are respectively connected to the inlet cavity; and / or, the diffuser is provided with a plurality of outlets, the plurality of outlets are distributed and spaced apart in the circumferential direction of the diffuser and are respectively connected to the outlet cavity.

[0012] According to the centrifugal compressor of some embodiments of the utility model, the plurality of inlets and the plurality of outlets are symmetrically distributed;

[0013] And / or, the inlet is located in a lower area of ​​the centrifugal compressor, and the outlet is located in an upper area of ​​the centrifugal compressor.

[0014] According to the centrifugal compressor of some embodiments of the utility model, the motor rotor outer sleeve is provided with a thrust plate, the impeller is formed with a limit stop surface facing the thrust plate, the comb tooth seal and the bearing assembly are limit stopped between the limit stop surface and the thrust plate; the end of the comb tooth seal is provided with a comb tooth seal tooth portion axially sealed with the limit stop surface, and / or the bearing assembly is provided with a bearing seal tooth portion axially sealed with the thrust plate.

[0015] According to the centrifugal compressor of some embodiments of the utility model, the limit stop surface is provided with an impeller sealing tooth portion which is plugged into and matched with the comb tooth sealing tooth portion; and / or the thrust plate is provided with a thrust plate sealing tooth portion which is plugged into and matched with the bearing sealing tooth portion.

[0016] According to some embodiments of the centrifugal compressor of the present invention, the bearing assembly includes a bearing chamber and a bearing member, the bearing member is installed in the bearing chamber, one end of the bearing chamber is axially opposite to the comb tooth seal and the other end is provided with the bearing seal tooth portion.

[0017] According to the centrifugal compressor of some embodiments of the present invention, the projection of the bearing seal tooth portion in the axial direction of the motor rotor coincides with the projection of at least part of the comb-teeth seal tooth portion in the axial direction of the motor rotor.

[0018] According to the centrifugal compressor of some embodiments of the present invention, a rotor bushing is further provided between the motor rotor and the comb-tooth seal, and the inner peripheral wall of the comb-tooth seal is provided with radial sealing teeth, and the radial sealing teeth are distributed around the rotor bushing.

[0019] The utility model also provides a water chiller.

[0020] According to the embodiment of the utility model, the chiller is provided with any one of the centrifugal compressors described above.

[0021] The utility model also provides an electrical appliance.

[0022] The electrical equipment according to the embodiment of the utility model is provided with any one of the centrifugal compressors described above.

[0023] The chiller, the electrical equipment and the centrifugal compressor have the same advantages as those of the prior art, which will not be described in detail here.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0026] Figure 1 The partial structural section of the centrifugal compressor according to the embodiment of the utility model Figure 1 ;

[0027] Figure 2 The partial structural section of the centrifugal compressor according to the embodiment of the utility model Figure 2 ;

[0028] Figure 3 It is a cross-sectional view of a diffuser and a comb seal according to an embodiment of the utility model.

[0029] Reference numerals:

[0030] Main housing 1, motor installation cavity 11, radial bearing 12, motor stator 13, motor rotor 14, volute structure 15,

[0031] Diffuser 2, cooling channel 21, inlet cavity 22, inlet port 221, first flow hole 222, outlet cavity 23, outlet port 231, second flow hole 232, partition 24, cooling cavity 25, diffuser cavity 3,

[0032] Impeller 4, limit stop surface 41, impeller sealing tooth portion 411,

[0033] Comb seal 5, comb seal tooth portion 51, radial seal tooth portion 52, seal 53, fixing hole 54,

[0034] Bearing assembly 6 , bearing chamber 61 , bearing seal tooth portion 611 , bearing member 62 , thrust plate 7 , rotor bushing 8 , bearing stator 91 , bearing coil 92 . DETAILED DESCRIPTION

[0035] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0036] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Reference below Figure 1-Figure 3 Description: A centrifugal compressor according to an embodiment of the utility model can reduce gas leakage loss, improve the compression efficiency of the centrifugal compressor, thereby improving the energy efficiency of the centrifugal compressor, and ensure the operating reliability of motor components.

[0039] like Figure 1-Figure 3 As shown, a centrifugal compressor according to an embodiment of the present invention includes: a main casing 1 , a volute structure 15 and a diffuser 2 .

[0040] A motor installation cavity 11 is formed in the main housing 1, and motor components are installed in the motor installation cavity 11. The motor components include a stator assembly and a rotor assembly. The rotor assembly includes a motor rotor 14. A volute structure 15 and a diffuser 2 are connected to the end of the main housing 1. A diffuser cavity 3 is defined between the volute structure 15 and the diffuser 2. The motor rotor 14 is inserted through the stator assembly and the diffuser 2 to extend into the diffuser cavity 3. An end of the motor rotor 14 located in the diffuser cavity 3 is connected to an impeller 4. The motor rotor 14 is provided with an axially distributed comb seal 5 and a bearing assembly 6 on its outer sleeve. The diffuser 2 is sleeved outside the comb seal 5. The ends of the comb seal 5 and the bearing assembly 6 that are away from each other and / or the inner circumferential wall of the comb seal 5 are provided with sealing teeth. The diffuser 2 or the diffuser 2 and the comb seal 5 together define a cooling channel 21.

[0041] Among them, the centrifugal compressor is also called a vortex compressor, which is a type of compressor. The centrifugal compressor is composed of a rotor, a stator and bearings. The impeller 4 and other parts are mounted on the motor rotor 14 to form a rotor assembly. The motor stator 13 is driven by the power machine to rotate at high speed. When the impeller 4 rotates at high speed, due to the interaction between the blades and the gas, the gas is sucked from the center of the impeller 4 and flows along the blade channel to the outer edge of the impeller 4. At this time, the impeller 4 works on the gas, the gas gains energy, and the pressure and speed increase. Then the gas flows through the diffuser 2 and other channels, the speed decreases, and the pressure further increases, that is, the kinetic energy is converted into pressure energy. The gas flowing out of the diffuser 2 can enter the volute chamber for transportation, or it can pass through the bend and the return device to enter the next stage for further compression to meet the use requirements.

[0042] Specifically, the centrifugal compressor is provided with a main shell 1, and the main shell 1 can be set to a rectangular or cylindrical shape according to usage requirements. The main shell 1 is arranged at the outermost side of the centrifugal compressor, and a motor installation cavity 11 is formed inside the main shell 1. The motor components can be installed in the motor installation cavity 11, that is, the main shell 1 can be used to install the motor components, and arranging the motor components inside the main shell 1 can ensure the operating reliability of the motor components, and at the same time can avoid pollution to the outside world caused by the motor components during operation, thereby improving environmental protection.

[0043] Furthermore, the centrifugal compressor is also provided with a volute structure 15 and a diffuser 2. The diffuser 2 can be connected to the end of the main casing 1 by bolts and other structures, and the volute structure 15 is connected to the side of the diffuser 2 away from the main casing 1. The volute structure 15 and the diffuser 2 jointly define a diffusion chamber 3. The motor component is provided with a stator assembly and a rotor assembly. The electronic component is provided with a radial bearing 12, etc. The rotor assembly is provided with a motor stator 13 and a motor rotor 14, etc., and the motor rotor 14 can be penetrated by the stator assembly and the diffuser 2, and then extend into the diffusion chamber 3, that is, one end of the motor rotor 14 is located in the diffusion chamber 3, and an impeller 4 is provided in the diffusion chamber 3, and the impeller 4 is connected to one end of the motor rotor 14 located in the diffusion chamber 3, so that when the impeller 4 rotates, gas can be sucked into the diffusion chamber 3, and then the gas is compressed to meet the use requirements.

[0044] A comb tooth seal 5 and a bearing assembly 6 are also sleeved on the outside of the motor rotor 14. The comb tooth seal 5 and the bearing assembly 6 are distributed in the axial direction, and the comb tooth seal 5 is located on the side close to the diffuser chamber 3, and the bearing assembly 6 is located on the side close to the motor mounting chamber 11. The diffuser 2 is sleeved on the outside of the comb tooth seal 5, and the bearing stator 91 in the stator assembly can be sleeved on the outside of the bearing assembly 6. The ends of the comb tooth seal 5 and the bearing assembly 6 facing away from each other and / or the inner circumferential wall of the comb tooth seal 5 are provided with sealing teeth. The sealing teeth can be provided only at the ends of the comb tooth seal 5 and the bearing assembly 6 facing away from each other, or only at the inner circumferential wall of the comb tooth seal 5, or both at the ends of the comb tooth seal 5 and the bearing assembly 6 facing away from each other and at the inner circumferential wall of the comb tooth seal 5.

[0045] like Figure 1-Figure 2As shown, in this embodiment, the ends of the comb-tooth seal 5 and the bearing assembly 6 that are away from each other and the inner peripheral wall of the comb-tooth seal 5 are provided with sealing teeth, and the sealing teeth can be provided with a plurality of right-angled trapezoidal protrusions, and grooves are formed between adjacent right-angled trapezoidal protrusions. When the gas enters the diffusion chamber 3 through the impeller 4, part of the gas can leak into the motor installation chamber 11 along the gaps between the impeller 4 and the comb-tooth seal 5, etc., and the ends of the comb-tooth seal 5 and the bearing assembly 6 that are away from each other and the inner peripheral wall of the comb-tooth seal 5 are provided with sealing teeth, so that when the gas leaks to the sealing teeth, it needs to pass through a plurality of protrusions and grooves, thereby increasing the path length of the gas leakage process, reducing the gas leakage loss, improving the compression efficiency of the centrifugal compressor, and thus improving the energy efficiency of the centrifugal compressor. Among them, the protrusions of the sealing teeth can be set to trapezoidal, rectangular, etc., and can be adjusted according to actual use requirements.

[0046] Among them, the comb seal is also called a labyrinth seal. Its sealing principle is to produce a throttling effect on the gas through the comb gap to play a sealing role. When the gas flows from the high-pressure end to the low-pressure end under the action of the pressure difference before and after the seal, the gas speed increases when the gas passes through the tooth gap, and the pressure and temperature are reduced. When the airflow enters the cavity between the sealing plates from the tooth gap, the flow area suddenly expands, and the airflow forms a strong vortex, so that the speed almost completely disappears, the kinetic energy is completely converted into heat, the pressure remains unchanged, and the temperature rises, returning to the temperature before the sealing plate. Every time the airflow passes through a tooth gap and cavity, the change of the airflow repeats the above process. This is repeated tooth by tooth until all seals are passed, the pressure becomes lower and lower, the specific volume becomes larger and larger, the airflow speed becomes higher and higher, and finally the pressure approaches the back pressure, but the temperature remains unchanged, thereby achieving the purpose of sealing.

[0047] The diffuser 2 or the diffuser 2 and the comb seal 5 define the cooling channel 21 together. The cooling channel 21 can be provided in the diffuser 2, or the diffuser 2 and the comb seal 5 can define the cooling channel 21 together. Figure 1-Figure 2 As shown, the diffuser 2 and the comb-tooth seal 5 jointly define a cooling channel 21. The diffuser 2 can be connected to the end of the main casing 1 by bolts and other structures. A motor mounting cavity 11 is formed inside the main casing 1, and a volute structure 15 is connected to the side of the diffuser 2 away from the main casing 1. The volute structure 15 and the diffuser 2 jointly define a diffuser cavity 3, that is, the motor mounting cavity 11 and the diffuser cavity 3 are located on both sides of the diffuser 2. The diffuser 2 is sleeved outside the comb-tooth seal 5 and jointly defines the cooling channel 21.

[0048] Furthermore, the cooling channel 21 can cool down the high-temperature gas in the diffuser chamber 3 to prevent the high temperature from being transmitted to the motor installation chamber 11, resulting in insulation failure, shortened parts life and other problems, thereby ensuring the operating reliability of the components in the motor installation chamber 11 and extending the service life of the components. It can also reduce the temperature of the gas discharged from the impeller 4, thereby reducing the gas lift and improving the compression efficiency, thereby improving the energy efficiency of the centrifugal compressor. When the leaked gas flows through the comb tooth seal 5, the cooling channel 21 defined by the diffuser 2 and the comb tooth seal 5 can cool the leaked gas, which can reduce the gas leakage amount and also reduce the temperature of the gas leaked into the motor installation chamber 11, further ensuring the operating reliability of the components in the motor installation chamber 11.

[0049] And if Figure 2 As shown, a seal 53 is further provided between the inner circumferential wall of the diffuser 2 and the outer circumferential wall of the comb-tooth seal 5. The seal 53 can be provided as a sealing ring. Two seals 53 can be provided. The two seals 53 are distributed and spaced apart in the axial direction, thereby ensuring the sealing between the diffuser 2 and the comb-tooth seal 5. The comb-tooth seal 5 is also provided with a fixing hole to ensure the installation reliability of the comb-tooth seal 5.

[0050] According to the centrifugal compressor of the embodiment of the utility model, sealing teeth are provided at the ends of the comb tooth seal 5 and the bearing assembly 6 which are away from each other and on the inner peripheral wall of the comb tooth seal 5 to increase the path length of the gas leakage process, thereby reducing gas leakage losses, improving the compression efficiency of the centrifugal compressor, and further improving the energy efficiency of the centrifugal compressor. The gas temperature can be lowered through the cooling channel 21, thereby ensuring the operating reliability of the motor components in the motor installation cavity 11, with better use effect and wider application range.

[0051] In some embodiments, the diffuser 2 is formed with an inlet cavity 22 and an outlet cavity 23 , a cooling cavity 25 is formed between the diffuser 2 and the comb seal 5 , and the inlet cavity 22 and the outlet cavity 23 are respectively connected to the cooling cavity 25 to jointly construct a cooling channel 21 .

[0052] Specifically, Figure 1-Figure 2 As shown, the diffuser 2 and the comb seal 5 together define a cooling channel 21, which can cool the high-temperature gas in the diffuser cavity 3 to ensure operational reliability. Figure 3 As shown, the diffuser 2 is formed with an inlet cavity 22 and an outlet cavity 23, and the inlet cavity 22 and the outlet cavity 23 are connected. The coolant can flow into the inlet cavity 22, and then flow from the inlet cavity 22 to the outlet cavity 23. The inlet cavity 22 can be arranged below the outlet cavity 23, so that the coolant needs to fill the inlet cavity 22 under the action of gravity before flowing into the outlet cavity 23, thereby slowing down the flow speed of the coolant and improving the cooling effect.

[0053] Furthermore, a cooling chamber 25 is formed between the diffuser 2 and the comb-tooth seal 5, and the diffuser 2 is sleeved outside the comb-tooth seal 5, that is, the cooling chamber 25 is arranged between the inlet chamber 22 and the outlet chamber 23, and the inlet chamber 22 and the cooling chamber 25 are connected, and the coolant flowing into the inlet chamber 22 can flow into the cooling chamber 25, and the cooling chamber 25 and the outlet chamber 23 are connected, and the coolant in the cooling chamber 25 can also flow into the outlet chamber 23, and then be discharged from the diffuser 2, so that the inlet chamber 22, the outlet chamber 23 and the cooling chamber 25 are jointly constructed as a cooling flow channel 21, so that the gas in the diffuser chamber 3 can be cooled and the gas leaked around the comb-tooth seal 5 can also be cooled and the operation reliability can be ensured.

[0054] In some embodiments, the inlet cavity 22 and the outlet cavity 23 are separated by a partition 24 , and the inlet cavity 22 and the outlet cavity 23 are symmetrically distributed on both sides of the cooling cavity 25 .

[0055] Specifically, the diffuser 2 is formed with an inlet cavity 22, an outlet cavity 23 and a cooling cavity 25. The cooling cavity 25 is arranged between the inlet cavity 22 and the outlet cavity 23, and the inlet cavity 22 and the outlet cavity 23 are respectively connected to the cooling cavity 25. The coolant can flow into the inlet cavity 22, and flow into the outlet cavity 23 through the cooling cavity 25, so that the coolant can flow to various parts of the diffuser 2, ensuring that the gas can be cooled and cooled at various parts of the diffuser 2, and ensuring that the diffuser 2 can reduce the conduction of heat from various parts in the diffuser cavity 3 to the motor mounting cavity 11, thereby improving the cooling effect.

[0056] Furthermore, a partition 24 is provided between the inlet chamber 22 and the outlet chamber 23. The partition 24 can be set as a plate-like structure, etc., and the partition 24 can separate the inlet chamber 22 and the outlet chamber 23 into two independent chambers. The inlet chamber 22 and the outlet chamber 23 are symmetrically distributed on both sides of the cooling chamber 25, that is, the cavity volume of the inlet chamber 22 is the same as the cavity volume of the outlet chamber 23, so that the volume of the coolant entering the inlet chamber 22 and the outlet chamber 23 is equal, thereby ensuring the stability of the coolant flow rate and improving the cooling effect.

[0057] In some embodiments, the cooling chamber 25 is constructed as an annular chamber distributed around the comb seal 5, and the diffuser 2 is provided with a first flow hole 222 connecting the inlet chamber 22 and the cooling chamber 25 and a second flow hole 232 connecting the outlet chamber 23 and the cooling chamber 25.

[0058] Specifically, the diffuser 2 is formed with an inlet chamber 22 and an outlet chamber 23, and the inlet chamber 22 and the outlet chamber 23 are connected. The diffuser 2 is sleeved outside the comb tooth seal 5, and a cooling chamber 25 is formed between the diffuser 2 and the comb tooth seal 5. The cooling chamber 25 is constructed as an annular chamber distributed around the comb tooth seal 5, and the cooling chamber 25 is arranged between the inlet chamber 22 and the outlet chamber 23.

[0059] Furthermore, a first flow hole 222 is provided in the diffuser 2, and the first flow hole 222 can be connected between the inlet chamber 22 and the cooling chamber 25, that is, after the coolant enters the inlet chamber 22, it can flow into the cooling chamber 25 through the first flow hole 222, and a second flow hole 232 is also provided in the diffuser 2, and the second flow hole 232 can be connected between the cooling chamber 25 and the outlet chamber 23, that is, the coolant in the cooling chamber 25 can flow into the outlet chamber 23 through the second flow hole 232. The cooling chamber 25 is distributed around the comb tooth seal 5, so that the coolant in the cooling chamber 25 can cool the comb tooth seal 5 in all directions, and then can cool the airflow flowing outside the comb tooth seal 5, thereby avoiding the leakage of high-temperature airflow into the motor installation chamber 11 to affect the components in the motor installation chamber 11, thereby ensuring the operating stability of the components.

[0060] In some embodiments, the first flow hole 222 and the second flow hole 232 are located on two sides of the cooling cavity 25 and are distributed opposite to each other along the radial direction of the cooling cavity 25 .

[0061] Specifically, Figure 3 As shown, the diffuser 2 is provided with a first flow hole 222 and a second flow hole 232. The first flow hole 222 can be connected between the inlet chamber 22 and the cooling chamber 25, and the second flow hole 232 can be connected between the cooling chamber 25 and the outlet chamber 23. The first flow hole 222 and the second flow hole 232 are located on both sides of the cooling chamber 25 and are distributed opposite to each other along the radial direction of the cooling chamber 25, that is, the coolant can enter the cooling chamber 25 from one side of the cooling chamber 25, and then flow out of the cooling chamber 25 from the other side of the cooling chamber 25. The cooling chamber 25 can be constructed An annular cavity is formed, and the first flow hole 222 and the second flow hole 232 are arranged to be distributed opposite to each other along the radial direction of the cooling cavity 25, so that the coolant can be equally divided into two equal parts when entering the cooling cavity 25 through the first flow hole 222, and then flow from both sides of the cooling cavity 25 to the second flow hole 232 respectively, so that the coolant has the same cooling effect on both sides of the comb tooth seal 5, thereby ensuring the cooling effect on the comb tooth seal 5, so as to cool the airflow flowing outside the comb tooth seal 5 and ensure the operating stability of the components.

[0062] In some embodiments, the inlet cavity 22 and the outlet cavity 23 are both constructed as arc-shaped cavities extending along the circumference of the diffuser 2 , and the inlet cavity 22 and the outlet cavity 23 are co-centeredly distributed.

[0063] Specifically, Figure 3As shown, the diffuser 2 is provided with an inlet cavity 22 and an outlet cavity 23, which are symmetrically distributed on both sides of the cooling cavity 25 and are both connected to the cooling cavity 25. The inlet cavity 22 and the outlet cavity 23 can be set as arc-shaped cavities, and the inlet cavity 22 and the outlet cavity 23 both extend along the circumference of the diffuser 2. The inlet cavity 22 and the outlet cavity 23 are both set as arc-shaped cavities, so that the flow resistance of the coolant in the inlet cavity 22 and the outlet cavity 23 is smaller, thereby reducing the energy loss of the coolant and improving the cooling efficiency. The inlet cavity 22 and the outlet cavity 23 are cocentrically distributed, and the cooling cavity 25 is arranged between the inlet cavity 22 and the outlet cavity 23, and is also cocentrically arranged with the inlet cavity 22 and the mixed outlet cavity 23, so that the cooling effect of the coolant on the comb seal 5 at all locations is the same, thereby ensuring the cooling reliability.

[0064] In some embodiments, the diffuser 2 is provided with a plurality of inlet ports 221, which are spaced apart and distributed in the circumferential direction of the diffuser 2 and are respectively connected to the inlet cavity 22; and / or, the diffuser 2 is provided with a plurality of outlet ports 231, which are spaced apart and distributed in the circumferential direction of the diffuser 2 and are respectively connected to the outlet cavity 23.

[0065] Specifically, Figure 3 As shown, the diffuser 2 is provided with a plurality of inlets 221, that is, the inlet 221 can be set to two, three, etc., and in the present embodiment, three inlets 221 are provided, and the plurality of inlets 221 are spaced apart and distributed in the circumferential direction of the diffuser 2 and are respectively connected with the inlet cavity 22, that is, the coolant can flow into the inlet cavity 22 through the plurality of inlets 221, thereby improving the efficiency of conveying the coolant into the inlet cavity 22 and improving the cooling effect, and the diffuser 2 is provided with a plurality of outlets 231, that is, the outlet 231 can be set to two, three, etc., and in the present embodiment, three outlets 231 are provided, and the plurality of outlets 231 are spaced apart and distributed in the circumferential direction of the diffuser 2 and are respectively connected with the outlet cavity 23, that is, the coolant can be discharged to the outside of the outlet cavity 23 through the plurality of outlets 231, thereby improving the efficiency of conveying the coolant out of the outlet cavity 23 and improving the cooling effect.

[0066] In some embodiments, the plurality of inlet ports 221 and the plurality of outlet ports 231 are symmetrically distributed.

[0067] Specifically, the diffuser 2 is provided with a plurality of inlet ports 221 which are spaced apart and distributed in the circumferential direction of the diffuser 2 and are respectively connected to the inlet cavity 22, and a plurality of outlet ports 231 which are spaced apart and distributed in the circumferential direction of the diffuser 2 and are respectively connected to the outlet cavity 23. The plurality of inlet ports 221 and the plurality of outlet ports 231 are symmetrically distributed, such as Figure 3As shown, three inlets 221 are provided, and three outlets 231 are also provided. One of the inlets 221 is provided at the bottom of the diffuser 2, and the other two inlets 221 are symmetrically provided near the partition 24 and are equidistant from the bottom inlet 221, so that the multiple inlets 221 can simultaneously transport coolant to the inlet cavity 22, and one of the outlets 231 is provided at the top of the diffuser 2, and the other two outlets 231 are symmetrically provided near the partition 24 and are equidistant from the top outlet 231, so that the inlet cavity 22 can simultaneously discharge coolant from the multiple outlets 231, thereby improving the cooling effect of the diffuser 2.

[0068] And / or, the inlet 221 is located in the lower area of ​​the centrifugal compressor, and the outlet 231 is located in the upper area of ​​the centrifugal compressor, such as Figure 3 As shown, the diffuser 2 is formed with an inlet chamber 22 and an outlet chamber 23, and the inlet chamber 22 and the outlet chamber 23 are connected. The inlet chamber 22 is provided with an inlet port 221, and the coolant can flow into the inlet chamber 22 through the inlet port 221. The outlet chamber 23 is provided with an outlet port 231, and the coolant can flow out of the outlet chamber 23 through the outlet port 231. The inlet chamber 22 can be arranged below the outlet chamber 23, that is, the inlet port 221 is located in the lower area of ​​the centrifugal compressor, and the outlet port 231 is located in the upper area of ​​the centrifugal compressor, so that the coolant needs to fill the inlet chamber 22 under the action of gravity before flowing into the outlet chamber 23, thereby slowing down the flow speed of the coolant and improving the cooling effect.

[0069] In some embodiments, a thrust plate 7 is provided on the outer sleeve of the motor rotor 14, the impeller 4 is formed with a limit stop surface 41 facing the thrust plate 7, and the comb tooth seal 5 and the bearing assembly 6 are limit stopped between the limit stop surface 41 and the thrust plate 7; the end of the comb tooth seal 5 is provided with a comb tooth seal tooth portion 51 axially sealed with the limit stop surface 41, and / or the bearing assembly 6 is provided with a bearing seal tooth portion 611 axially sealed with the thrust plate 7.

[0070] Specifically, the centrifugal compressor is further provided with a thrust plate 7, which is also sleeved outside the motor rotor 14 and is located on the side of the bearing assembly 6 away from the comb seal 5, such as Figure 1-Figure 2 As shown, the impeller 4 forms a limit stop surface 41, and the limit stop surface 41 is formed on the side of the impeller 4 close to the comb tooth seal 5, and the comb tooth seal 5 and the bearing assembly 6 are arranged between the limit stop surface 41 and the thrust plate 7, and the limit stop surface 41 is opposite to the comb tooth seal 5 along the axial part, and the thrust plate 7 is opposite to the bearing assembly 6 along the axial part, so that the comb tooth seal 5 and the bearing assembly 6 are axially located between the limit stop surface 41 and the thrust plate 7, thereby limiting the axial position of the comb tooth seal 5 and the bearing assembly 6 to ensure operational reliability.

[0071] Furthermore, the end of the comb tooth seal 5 is provided with a comb tooth seal tooth portion 51 axially sealed with the limit stop surface 41, and / or the bearing assembly 6 is provided with a bearing seal tooth portion 611 axially sealed with the thrust plate 7. That is, the comb tooth seal tooth portion 51 is only provided at the end of the comb tooth seal 5, or the bearing seal tooth portion 611 is only provided at the bearing assembly 6. The comb tooth seal tooth portion 51 is also provided at the end of the comb tooth seal 5, and the bearing seal tooth portion 611 is provided at the bearing assembly 6.

[0072] In this embodiment, if Figure 2 As shown, a comb tooth seal tooth portion 51 is provided at the end of the comb tooth seal 5, and a bearing seal tooth portion 611 is provided at the bearing assembly 6. The comb tooth seal tooth portion 51 can be axially sealed with the limit stop surface 41, and the bearing seal tooth portion 611 can be axially sealed with the thrust plate 7, thereby sealing the gas multiple times to reduce gas leakage, and when the comb tooth seal 5 and the bearing assembly 6 move axially to the left or right, the sealing tooth portion on at least one side in the axial direction can seal the gas, thereby ensuring the sealing reliability.

[0073] In some embodiments, the limit stop surface 41 is provided with an impeller seal tooth portion 411 which is plugged into and matched with the comb seal tooth portion 51 ; and / or the thrust plate 7 is provided with a thrust plate seal tooth portion which is plugged into and matched with the bearing seal tooth portion 611 .

[0074] Specifically, the limit stop surface 41 is provided with an impeller sealing tooth portion 411 which is plugged into and matched with the comb tooth sealing tooth portion 51; and / or, the thrust plate 7 is provided with a thrust plate sealing tooth portion which is plugged into and matched with the bearing sealing tooth portion 611. That is, the impeller sealing tooth portion 411 can be provided only on the limit stop surface 41, or only on the thrust plate 7, or the impeller sealing tooth portion 411 can be provided on the limit stop surface 41, and the thrust plate 7 can be provided with a thrust plate sealing tooth portion at the same time. The impeller sealing tooth portion 411 can be plugged into and matched with the comb tooth sealing tooth portion 51, and the thrust plate sealing tooth portion can also be plugged into and matched with the bearing sealing tooth portion 611, so that the gas needs to flow from the gap between the impeller sealing tooth portion 411 and the comb tooth sealing tooth portion 51 and the gap between the thrust plate sealing tooth portion and the bearing sealing tooth portion 611, thereby increasing the path length of the gas leakage process and reducing the gas leakage loss.

[0075] In some embodiments, the bearing assembly 6 includes a bearing chamber 61 and a bearing member 62. The bearing member 62 is installed in the bearing chamber 61. One end of the bearing chamber 61 is axially opposite to the comb seal 5 and the other end is provided with a bearing seal tooth portion 611.

[0076] Specifically, the bearing assembly 6 is sleeved outside the motor rotor 14 and is arranged between the comb seal 5 and the thrust plate 7. Figure 1-Figure 2As shown, the bearing assembly 6 is provided with a bearing chamber 61 and a bearing member 62. The bearing member 62 is sleeved outside the motor rotor 14, and the bearing chamber 61 is sleeved outside the bearing member 62, that is, the bearing is installed between the motor rotor 14 and the bearing chamber 61. The bearing member 62 can provide support for the bearing chamber 61 and other structures to ensure operational reliability. The end portion of the comb tooth seal 5 close to the bearing assembly 6 is axially opposite to the bearing member 62, and the end portion is axially opposite to the bearing chamber 61, and the bearing chamber 61 is provided with a bearing at one end away from the comb tooth seal 5. The sealing tooth portion 611, that is, the gas leaking from the diffuser chamber 3 to the impeller 4 and the comb tooth seal 5 can first pass through the impeller sealing tooth portion 411 and the comb tooth sealing tooth portion 51 to reduce gas leakage. When the remaining gas flows between the bearing chamber 61 and the thrust plate 7, it can flow to the end of the bearing chamber 61 away from the comb tooth seal 5, where the bearing sealing tooth portion 611 is provided to further reduce the leaked gas and ensure the operating reliability of the internal components of the motor mounting chamber 11. The bearing assembly 6 can also be provided with a bearing stator 91 and a bearing coil 92, etc.

[0077] In some embodiments, a projection of the bearing seal tooth portion 611 in the axial direction of the motor rotor 14 coincides with a projection of at least a portion of the comb seal tooth portion 51 in the axial direction of the motor rotor 14 .

[0078] Specifically, Figure 2 As shown, a comb-tooth seal tooth portion 51 extending in the axial direction is provided at the end of the comb-tooth seal 5 away from the bearing chamber 61, and a bearing seal tooth portion 611 extending in the axial direction is provided at the end of the bearing chamber 61 away from the comb-tooth seal 5. The comb-tooth seal tooth portion 51 can be axially sealed with the impeller seal tooth portion 411 provided on the limit stop surface 41, and the bearing seal tooth portion 611 can be axially sealed with the thrust plate 7, thereby sealing the gas multiple times to reduce gas leakage, and the axial projection of the bearing seal tooth portion 611 on the motor rotor 14 coincides with the axial projection of at least part of the comb-tooth seal tooth portion 51 on the motor rotor 14, so that when the comb-tooth seal 5 and the bearing chamber 61 move left or right along the axial direction of the motor rotor 14, the seal tooth portion on at least one side in the axial direction can seal the gas, thereby ensuring the sealing reliability.

[0079] In some embodiments, a rotor bushing 8 is further provided between the motor rotor 14 and the comb-tooth seal 5 , and the inner peripheral wall of the comb-tooth seal 5 is provided with radial sealing teeth 52 , which are distributed around the rotor bushing 8 .

[0080] Specifically, the comb seal 5 is sleeved outside the motor rotor 14, and as shown in FIG. Figure 1-Figure 2 As shown, the centrifugal compressor is further provided with a rotor bushing 8 , which is arranged between the motor rotor 14 and the comb-tooth seal 5 , that is, the rotor bushing 8 is sleeved on the outside of the motor rotor 14 and the comb-tooth seal 5 is sleeved on the outside of the rotor bushing 8 .

[0081] Furthermore, the comb tooth seal 5 is also provided with a radial sealing tooth portion 52, which is arranged on the inner circumferential wall of the comb tooth seal 5, and the radial sealing tooth portion 52 extends along the radial direction of the comb tooth seal 5 toward the motor rotor 14, and can be distributed around the rotor bushing 8. The comb tooth seal 5 is also provided with a comb tooth sealing tooth portion 51, and the comb tooth sealing tooth portion 51 is arranged at the end of the comb tooth seal 5 away from the bearing chamber 61, and the comb tooth sealing tooth portion 51 extends axially, so that the comb tooth seal 5 is provided with the comb tooth sealing tooth portion 51 extending axially and the radial sealing tooth portion 52 extending radially, which can seal the airflow multiple times and also seal the gas in both the axial and radial directions, thereby improving the sealing effect of the comb tooth seal 5, reducing gas leakage losses, and thus improving the compression efficiency of the centrifugal compressor.

[0082] The utility model also provides a water chiller.

[0083] According to the embodiment of the utility model, the chiller is provided with any one of the centrifugal compressors described above.

[0084] According to the chiller of the embodiment of the utility model, a centrifugal compressor is provided, and the centrifugal compressor is provided with sealing teeth at the ends of the comb tooth seal 5 and the bearing assembly 6 which are away from each other and on the inner circumferential wall of the comb tooth seal 5 to increase the path length of the gas leakage process, thereby reducing gas leakage losses, improving the compression efficiency of the centrifugal compressor, and further improving the energy efficiency of the centrifugal compressor, and the gas temperature can be lowered through the cooling flow channel 21, thereby ensuring the operating reliability of the motor components in the motor installation cavity 11, and having a better use effect and a wider range of applications.

[0085] The utility model also provides an electrical appliance.

[0086] The electrical equipment according to the embodiment of the utility model is provided with any one of the centrifugal compressors described above.

[0087] According to the electrical equipment of the embodiment of the utility model, a centrifugal compressor is provided, and the centrifugal compressor is provided with sealing teeth at the ends of the comb tooth seal 5 and the bearing assembly 6 which are away from each other and on the inner peripheral wall of the comb tooth seal 5 to increase the path length of the gas leakage process, thereby reducing gas leakage losses, improving the compression efficiency of the centrifugal compressor, and thus improving the energy efficiency of the centrifugal compressor, and the gas temperature can be lowered through the cooling flow channel 21, thereby ensuring the operating reliability of the motor components in the motor installation cavity 11, and having a better use effect and a wider range of applications.

[0088] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0089] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A centrifugal compressor, characterized in that: include: A main housing, wherein a motor installation cavity is formed in the main housing, and motor components are installed in the motor installation cavity. The motor components include a stator assembly and a rotor assembly, and the rotor assembly includes a motor rotor; a volute structure and a diffuser, wherein the volute structure and the diffuser are connected to ends of the main housing, a diffuser cavity is defined between the volute structure and the diffuser, the motor rotor is passed through the stator assembly and the diffuser to extend into the diffuser cavity, and an impeller is connected to one end of the motor rotor located in the diffuser cavity; The motor rotor outer sleeve is provided with a comb-tooth seal and a bearing assembly distributed along the axial direction, the diffuser is sleeved outside the comb-tooth seal, the ends of the comb-tooth seal and the bearing assembly facing away from each other and / or the inner circumferential wall of the comb-tooth seal are provided with sealing teeth, and the diffuser or the diffuser and the comb-tooth seal jointly define a cooling flow channel.

2. The centrifugal compressor according to claim 1, characterized in that: The diffuser is formed with an inlet cavity and an outlet cavity, a cooling cavity is formed between the diffuser and the comb seal, and the inlet cavity and the outlet cavity are respectively communicated with the cooling cavity to jointly form the cooling channel.

3. The centrifugal compressor according to claim 2, characterized in that: The inlet cavity and the outlet cavity are separated by a partition, and the inlet cavity and the outlet cavity are symmetrically distributed on both sides of the cooling cavity.

4. The centrifugal compressor according to claim 2, characterized in that: The cooling cavity is constructed as an annular cavity distributed around the comb seal, and a first flow hole connected between the inlet cavity and the cooling cavity and a second flow hole connected between the outlet cavity and the cooling cavity are provided in the diffuser.

5. The centrifugal compressor according to claim 4, characterized in that: The first flow hole and the second flow hole are located on two sides of the cooling cavity and are distributed opposite to each other along the radial direction of the cooling cavity.

6. The centrifugal compressor according to claim 2, characterized in that: The inlet cavity and the outlet cavity are both constructed as arc-shaped cavities extending along the circumference of the diffuser, and the inlet cavity and the outlet cavity are co-centeredly distributed.

7. The centrifugal compressor according to claim 6, characterized in that: The diffuser is provided with a plurality of inlet ports, which are spaced apart and distributed in the circumferential direction of the diffuser and are respectively connected to the inlet cavity; And / or, the diffuser is provided with a plurality of outlets, and the plurality of outlets are distributed and spaced apart in a circumferential direction of the diffuser and are respectively connected to the outlet cavity.

8. The centrifugal compressor according to claim 7, characterized in that: The plurality of inlets and the plurality of outlets are symmetrically distributed; And / or, the inlet is located in a lower area of ​​the centrifugal compressor, and the outlet is located in an upper area of ​​the centrifugal compressor.

9. The centrifugal compressor according to any one of claims 1 to 8, characterized in that: The motor rotor outer shell is provided with a thrust plate, the impeller is formed with a limit stop surface facing the thrust plate, and the comb seal and the bearing assembly are limit stopped between the limit stop surface and the thrust plate; The end of the comb-teeth seal is provided with a comb-teeth seal tooth portion axially sealed with the limit stop surface, and / or the bearing assembly is provided with a bearing seal tooth portion axially sealed with the thrust plate.

10. The centrifugal compressor according to claim 9, characterized in that: The limit stop surface is provided with an impeller sealing tooth portion which is plugged and matched with the comb tooth sealing tooth portion; And / or, the thrust plate is provided with a thrust plate sealing tooth portion which is plug-matched with the bearing sealing tooth portion.

11. The centrifugal compressor according to claim 9, characterized in that: The bearing assembly comprises a bearing chamber and a bearing component, wherein the bearing component is installed in the bearing chamber, one end of the bearing chamber is axially opposite to the comb tooth seal component and the other end is provided with the bearing seal tooth portion.

12. The centrifugal compressor according to claim 9, characterized in that: A projection of the bearing seal tooth portion in the axial direction of the motor rotor coincides with a projection of at least part of the comb seal tooth portion in the axial direction of the motor rotor.

13. The centrifugal compressor according to claim 1, characterized in that: A rotor bushing is further arranged between the motor rotor and the comb-tooth seal. The inner peripheral wall of the comb-tooth seal is provided with radial sealing teeth, and the radial sealing teeth are distributed around the rotor bushing.

14. A chiller, characterized in that: A centrifugal compressor according to any one of claims 1 to 13 is provided.

15. An electrical device, characterized in that: A centrifugal compressor according to any one of claims 1 to 13 is provided.

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